<?php

/**
 * Handler for showing comment module's node link.
 */
class views_handler_field_comment_node_link extends views_handler_field {

    function construct() {
        parent::construct();

        // Add the node fields that comment_link will need..
        $this->additional_fields['nid'] = array(
            'field' => 'nid',
        );
        $this->additional_fields['type'] = array(
            'field' => 'type',
        );
        $this->additional_fields['comment'] = array(
            'field' => 'comment',
        );
    }

    function option_definition() {
        $options = parent::option_definition();
        $options['teaser'] = array('default' => 0);
        return $options;
    }

    function options_form(&$form, &$form_state) {
        parent::options_form($form, $form_state);

        $form['teaser'] = array(
            '#type' => 'checkbox',
            '#title' => t('Show teaser-style link'),
            '#default_value' => $this->options['teaser'],
            '#description' => t('Show the comment link in the form used on standard node teasers, rather than the full node form.'),
        );
    }

    function query() {
        $this->ensure_my_table();
        $this->add_additional_fields();
    }

    function render($values) {
        // Build fake $node.
        $node = new stdClass();
        $node->nid = $values->{$this->aliases['nid']};
        $node->type = $values->{$this->aliases['type']};
        $node->comment = $values->{$this->aliases['comment']};

        // Call comment.module's hook_link: comment_link($type, $node = NULL, $teaser = FALSE)
        $links = comment_link('node', $node, $this->options['teaser']);
        // question: should we run these through:    drupal_alter('link', $links, $node);
        // might this have unexpected consequences if these hooks expect items in $node that we don't have?

        return !empty($links) ? theme('links', $links, array('class' => 'links inline')) : '';
    }

}

